Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf395c727f91e51…

MALICIOUS

PDF

82.5 KB Created: 2021-05-28 22:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5ab1c3fe9efb69fc9c83ce537ef2d8a SHA-1: d2a6e3507a5fdc06ae315a9dd5ceacd1e4f95ea7 SHA-256: 4bf395c727f91e5113b7f33fe5d2566ec7a7e48fd1f7ace8a12a26bf6e6fbd67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic indicate a phishing attempt, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=define+adjudicate+form
    • https://cdn-cms.f-static.net/uploads/4445882/normal_606bc01e4ba64.pdf
    • https://fubaxuzepavuzoz.weebly.com/uploads/1/3/4/7/134755559/kubuf_jetorowa.pdf
    • https://cdn-cms.f-static.net/uploads/4465694/normal_600de5ffbabef.pdf
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6051f15eb4040.pdf
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fe4dc5b9bd8e.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6030fd99aded3.pdf
    • https://lepivigodegobuz.weebly.com/uploads/1/3/7/5/137505729/bijelozuva.pdf
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6016e1e8c4cf7.pdf
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6011af5e993ca.pdf
    • https://cdn-cms.f-static.net/uploads/4455890/normal_6052fc2b914ce.pdf
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/rafudupik.pdf
    • https://cdn-cms.f-static.net/uploads/4411922/normal_605fd25c384cf.pdf
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5fc9a23732fb2.pdf
    • https://cdn-cms.f-static.net/uploads/4383146/normal_605f6a578e9b2.pdf
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62cc9a3c40.pdf
    • https://cdn-cms.f-static.net/uploads/4452193/normal_603845a8bb3f0.pdf
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fd7a8945cc20.pdf
    • https://tamigitaguvaz.weebly.com/uploads/1/3/4/0/134017812/4d1d00b6db606.pdf
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5fef7fc7d4ae5.pdf
    • https://cdn-cms.f-static.net/uploads/4371788/normal_603a2708cad29.pdf
    • https://deketonozalupu.weebly.com/uploads/1/3/3/9/133997688/vurazuzakidezilo.pdf
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/b3ce8bb834be00c.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_604cdbda850b6.pdf
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/tezizu.pdf
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/rofotonugorozin.pdf
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/4142504.pdf
    • https://cdn-cms.f-static.net/uploads/4421062/normal_600c90eef41e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93c.bin
ec508e42609dff7d79a21476d561f24d18c4cb7529aa8793b8c6cb878b0bb6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 4916 bytes
font_01_sfnt_off000109da.bin
57c776347ed99147dab2e2d107f433a963ec7fd03c96f5048f2253633e4ee38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10684 bytes
font_02_sfnt_off00012e44.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 4324 bytes

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